They were 'each other's first love,' claimed the star's longtime friend.

The relationship between Britney Spears, 35, and Justin Timberlake, 36, was one that shocked and defined much of Hollywood during the late ’90s and early 2000s. Now, 17 years later, REELZ has teamed up with The National Enquirer to tell all on the former couple’s early days.

“Many sources had told us that Britney and Justin were having a relationship,” said National Enquirer’s Associate Editor, James Robertson.

“They even said that they had shared their first kiss together when they were in the Mickey Mouse club,” added National Enquirer’s Managing Editor, Melissa Cronin.

“Fans of Britney, fans of Justin, readers of The National Enquirer could not get enough of this new power couple,” added Robertson.

“Britney Spears and Justin Timberlake dating was like the pop princess and the pop prince coming together for a royal wedding,” agreed Cronin.

Once they began making public appearances together, Spears’ own songs showed signs of their passionate relationship. In her lyrics it was evident she and Timberlake where no longer the young innocent children that had met years before in the Disney series.

As OK! readers know, Britney Spears and Justin Timberlake called it quits on their rocky relationship in 2003 after which the blonde bombshell became “depressed,” got married and suffered a mental breakdown! Did she ever get over her first love?